Cold heading machine



J. J. TOMALIS 2,322,262

COLD HEADING MACHINE June 2 2, 1943.

2 Sheets-Sheet 1 Filed Jan. 15, 1942 June 22, 1943. J. J. TOMALIS 2,322,262

COLD READING MACHINE Patented June 22, 1943 I 2,322,262 COLD READING MACHINE Joseph John Tomalls, Providence, B. L, assignorto American Screw Company, Providenc R. 1., a corporation of lthode Island Application January 15, 1942, Serial No. 426,910

' 8 Claims.

This invention relates to a cold heading machine which is primarily designed for forming the heads on screws or bolts of the kind shown in U. S. Patent No. 2,046,839, and punching the re-,

cesses in such heads. The machine may-be generally described as a two-blow heading machine in which there is a fixed or stationary die for holding the blank and two punches adjustably mounted on a punch slide which is carried by a horizontally reciprocating gate or ram, the slide being movable vertically on the ram so that the punches are forced against the blank successively to first form the head of the screw or bolt and then punch the recess therein.

In a two-blow machine of this kind it has been found of extreme importance to provide means by which the movable punches can be quickly and accurately positioned and adjusted in any desired direction relative to each other on the punch slide and relative to the stationary die. A slight inaccuracy in the setting of the punches and par ticularly the recess-forming punch will result in frequent breaking of the punch or in the production of a high percentage of ruptured or defective screw heads. Also it is extremely important that the means for positioning and adjusting the punch holders be so arranged that the same are easily and readily accessible to the operator, thus permitting quick and accurate adjustment of the same.. In an effort to meet these difliculties various arrangements have heretofore been employed in machines of this type without success. In general, these prior machines included a single holder for the punches mounted directly on the gate or on a punch-holding slide carried by the gate so that any change in the setting of one punch relative to the die resulted in a similar change of the other punch. Independent and accurate setting of each punch is impossible. In some cases the mechanism employed for operating the unch-carrying slide on the ram to'successively present the punches to the die includes complicated arrangements aimed to accurately position the punches, but these arrangements are diflicult of adjustment, particularly by inexperienced operators, with the result that excessive punch breakage is apt to occur especially in the recess-forming punch.

The present inventionaims to overcome the above defects and difliculties in machines of this type, and, in brief, this is accomplished. by pron'ding a separate holder for each punch and mounting these holders on the punch slide in such a manner that each punch can be independently adjusted in any direction relative to the die and to each other. By this arrangement each punch can be set with precise accuracy relative to the other and to the fixed 'die'and the difilculties above mentioned are obviated.

The invention is set forth in greater detail in the following specification and illustrated in the accompanying drawings, forming a part hereof, and in which:

Figure 1 is a fragmentary side elevation of a machine embodying the invention;

Figure 2 is a plan view of the same;

Figure 3 is a vertical transverse section on the line 33 of Figure 1;

Figure 4 is an enlarged horizontal section on the line 4-401 Figure 3;

Figure 5 is an enlarged side elevation of one of the punch holders; and

Figure 6 is an enlarged front elevation of one of the punch holders.

Referring to the drawings in detail, the ma-. chine embodies a frame III in which is slidably mounted a ram or gate 1 l, operated by any suitable mechanism (not shown), and which moves the ram horizontally toward and from the fixed die l2 supported in the frame It, the ram being adjustable forward and back by the well known wedge mechanism indicated at A. A vertically reciprocating punch-carrying slide i3 is mounted on the front end of the gate or ram II, and guided in its reciprocation by. any suitable guiding means on the ram. A U-shaped stop member I4 is secured to the top of the slide l3 and extends upwardly therefrom. A stop arm 15 is I rigidly mounted on the gate ll of the machine, as by bolt ISA, and this arm extends into position between the sides of the stop member l4. Adjustable stops HA and A are mounted respectively on the slide l3 and the member I! in position to engage the arm l5 and limit the upand-down movement of the slide I3. Vertical reciprocation of the slide I3 is effected by means of a yoke 20, keyed or otherwise rigidly secured to a transverse shaft 2| which is supported for oscillation in the frame l0. An arm 22 is rigidly secured to one end of the shaft 2|v and this arm is oscillated by means of a reciprocating member 23 operated from a cam 24 which is rotated by any suitable mechanism in the machine. To connect the yoke 20 with the slide l3, a plate I3B is rigidly secured to the lower part of the slide l3, as by bolts I30, and this plate is arranged in a substantially horizontal position. Each arm of the yoke 20 carries a slotted trunnion 20A and the plate BB is slidably received in the slots of. these trunnions. As a result, when the l2.- Ihe horizontally reciprocating ram H and the vertically reciprocating punch slide ii are arranged to operate in timed relation.

Rigidly mounted on the front face of the slide l3, as by bolts 25, is a backing or truss plate 26 on which the punch holders 30, 30 are adjustably mounted. The means for accurately adjusting the holders 30 and securing them in position are substantially the same for each holder. The truss plate 26, at its upper end and also at its lower end, is provided with a forwardly projecting lug 26A. Each of the punch holders 3!) is provided-at one of its upper corners with a laterally projecting ear 30A and on its diametrically opposite lower comer with a similar ear 30B. Bolts 3| extend through the ears 30A and 3013 into the truss plate '26 and serve to secure the the punch holders 30 with a threaded lug 26B and a bolt or set screw 32 is threaded through each of these lugsand into engagement with the punch holders. By careful manipulation of the bolts 32 accurate lateral adjustment of the holders can be made. The bolts 32 are preferably provided with lock nuts tofirmly hold the same in adjusted position. To obtain vertical adjustment of the holders 30, a bolt 33 is threaded through each of the upper and lower lugs 26A of the truss plate and provided with a lock nut for holding the same in position. The inner ends of the upper and lower bolts 33 are secured to their respective punch holders so as to permit lateral adjustment of the holders relative to these bolts. face of upper holder 30 and the lower surface of the lower holder 30, are provided with spaced hook-shaped lugs or extensions 34 and back of these lugs a rectangular plate 35 is arranged, these plates being provided with holes through which the adjusting screws 33 rotatably pass, the end of each screw being flanged or upset to form a, head for engaging the adjacent plate. The bolts 33 thus afford means for vertical adjustment of the holders 30 and at the same time they do not interfere with lateral adjustment of the same.

Any suitable punches may be mounted in the holders 3!! such for example as those illustrated in my prior Patent No. 2,165,424 which are designed to first form a head on a screw blank From the foregoing it will be seen that'thcinvention provides means by which the punches in a two-blow heading machine may be readily positioned with extreme accuracy even by inexperienced operators so that much of the diificulty heretofore encountered in the breaking of punches and rupturing of screw heads by punching the recesses therein may be avoided.

To accomplish this, the upper surclaimed as new and desired to be secured by Letters Patent is:

1. In a machine of the kind described. a stationary die, a ram movable toward and from said die, a slide carried by said ram, two independent punch holders carried by said slide one above the other, means for vertically reciprocating said slide on said ram to alternately present said holders to said fixed die, two lugs on said slide one above the upper punch holder and one below the lower punch holder, a set screw threaded through each of said lugs and engaging said holders, whereby said holders may be vertically adjusted on the slide, a threaded lug carried by said slide on each side of each of said holders, and aset screw threaded through each of said last named lugs and engaging said holders, whereby the holders may be laterally adjusted on the slide, and means for locking said holders to the slide.

2. In a screw heading and punching machine. a stationary die for holding a blank, 9. reciprocating ram movable toward and from said die, a punch-carrying slide mounted on and movable with said ram toward and from said die, two

independent punch holders carried by said slide,

means for reciprocating said slide and holders in a direction transverse to the movement of said ram, to present said holders alternately to said die, and cooperating means on each of said holders and said slide for independently adjustin each holder on said slide toward or from or laterally of the other holder on said slide.

3. In a screw heading and punching machine, a stationary die for holding a blank, a reciprocating ram movable toward and from said die, a punch-carrying slide mounted on and movable with said ram toward and from said die, two independent punch holders carried by said slide, means for reciprocating said slide and holders in a direction transverse to the movement of said ram, to present said holders alternately to said die, and cooperating means on each of said holders and said slide for independently adjusting each holder on the slide toward or from or diagonally of the other holder.

4. In ascrew heading and punching machine, a stationary die for holding a blank, a reciprocating ram movable toward and from said die, a punch-carrying slide mounted on and movable with said ram toward and from said die, two independent punch holders carried by said slide, means for reciprocating said slide and holders in a direction transverse to the movement of said' .ram, to present said holders alternately to said die, cooperating means on said slide and each of said holders for independently adjusting each holder toward and from the other holder in the direction of reciprocation of said slide and other cooperating means on said slide and each of said holders for adjusting the latter in a direction transverse to the reciprocating movement of said slide.

'5. In a screw heading and punching machine of the kind described, a stationary die for holding a blank, a ram movable horizontally toward and from said die, a punch-carrying slide mounted on and movable with said ram, two independent punch holders mounted on said slide, means for reciprocating said slide vertically on said ram to alternately present said punch holders to said die, and separate means on said slide and holders for independently adjusting each of said holders vertically and laterally relative the other and Having thus described the invention, wh t i relative to said slide.

6. In a screw heading and punching machine of the kind described, a stationary die for supporting a blank, a ram movable horizontally toward and from said die, a slide carried by said ram, two independent punch holders carried by said slide, means for vertically reciprocating said slide and holders on the ram in timed relation with the reciprocation of the ram, whereby said holders are alternately presented to said die, independent cooperating means on said slide and each of said holders for independently adjusting the holders on the slide in a direction transverse to the vertical movement thereof, and separate means on said slide and each of said holders for adjusting the holders vertically on the slide.

7. In a screw heading and punching machine of the kind described, a stationary die, a ram movable toward and from said die, a slide carried by and movable with said ram, two independent punch holders carried by said slide, one above the other, independent means for adjusting each of said holders vertically toward or from the other, independent means for adjusting each of said holders laterally of the direction 0! movement of said ram, an ear secured to each side of each of said holders, and bolts engaging said ears and said slide for rigidly securing the hold- 'mounted one above the other, means for moving said holders alternately toward said die, and means for adjustably securing said holders on said slide, said last named means comprising two lugs on said slide one above the upper punch holder and one below the lower punch holder, a set screw threaded through each of said lugs and engaging said holders, whereby the holders may be vertically adjusted on said slide. a threaded lug carried by said slide on each side of each of said holders, and a set screw threaded through each of the said last named lugs and engaging said holders, whereby the holders may be laterally adjusted on the slide, and means for locking said holders in adjusted position on the slide.

JOSEPH JOHN TQMALIS. 

